Car comparison

AC Ace 4.6 i V8 32VvsBMW 6 Series Convertible (E64) 645Ci

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

AC Ace

4.6 i V8 32V

326 hp4601 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible1997-2000
VS

BMW 6 Series Convertible (E64)

645Ci

333 hp4398 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2003-2005

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

BMW 6 Series Convertible (E64) 645Ci

  • Most powerful
    333 hp
    248 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Lowest highway consumption
    9.6 L/100 km
    24.5 mpg US
    29.4 mpg UK
  • Largest trunk
    300 L
  • Best overall score
    59/100
  • Best economy score
    72/100
  • Best practicality score
    45/100

AC Ace 4.6 i V8 32V

  • Quickest 0-100 km/h
    5.7 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Lightest
    1,510 kg
    3,329 lb
  • Best power-to-weight
    216 hp/t
    161 kW/t
    4.6 kg/hp
  • Lowest city consumption
    15.1 L/100 km
    15.6 mpg US
    18.7 mpg UK
  • Best performance score
    67/100

Specification comparison

Specification comparison
ModelACAce4.6 i V8 32VBMW6 Series Convertible (E64)645Ci
Power
326hp243kW
333hp248kW
Torque
427Nm315lb-ft
450Nm332lb-ft
Curb weight
1,510kg3,329lb
1,815kg4,001lb
Gross weight-
2,215kg4,883lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
74.2s99% target: 257 km/h / 160 mph
Calculated
87.6s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.7s
6.1s
0-200 km/h
20.1s
Calculated
22.6s
Calculated
0-60 mph
5.4s
Calculated
5.8s
Calculated
Fuel consumption-
12.9L/100 km18.2mpg US21.9mpg UK
Fuel consumption city
15.1L/100 km15.6mpg US18.7mpg UK
18.5L/100 km12.7mpg US15.3mpg UK
Fuel consumption highway
10.5L/100 km22.4mpg US26.9mpg UK
9.6L/100 km24.5mpg US29.4mpg UK
Quarter mile
13.8s
Calculated
14.2s
Calculated
Power-to-weight
216hp/t161kW/t98hp/1000 lb
Calculated
183hp/t137kW/t83hp/1000 lb
Calculated
Torque-to-weight
283Nm/t189lb-ft/ton
Calculated
248Nm/t166lb-ft/ton
Calculated
Estimated range-
543km337mi
Calculated
Displacement
4,601cc281cu in
4,398cc268cu in
Length
4,420mm174in
4,820mm190in
Width
1,870mm74in
1,855mm73in
Height
1,300mm51in
1,373mm54in
Wheelbase
2,470mm97in
2,780mm109in
Front track
1,590mm63in
1,558mm61in
Rear track
1,570mm62in
1,592mm63in
Trunk volume
185L
300L
Max trunk volume
300L
350L
Doors
2
2
Seats
2
4
Fuel tank
90L
70L

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

AC Ace 4.6 i V8 32VBMW 6 Series Convertible (E64) 645CiPowerTorque
  • AC Ace 4.6 i V8 32V: Power / Torque
  • BMW 6 Series Convertible (E64) 645Ci: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
ACAce4.6 i V8 32V5,800 rpm4,600 rpm6,050 rpm
BMW6 Series Convertible (E64)645Ci6,100 rpm3,600 rpm6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricACAce4.6 i V8 32VBMW6 Series Convertible (E64)645Ci
Acceleration checkpoints
0-60 mph
0-97 km/h
5.4 s
5.8 s
0-100 km/h
0-62 mph
5.7 s
6.1 s
0-200 km/h
0-124 mph
20.1 s
22.6 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.3 s
2.3 s
330 ft
101 m
6.0 s
6.2 s
1/8 mile
201 m
9.1 s
9.3 s
1000 ft
305 m
11.6 s
12.0 s
1/4 mile
402 m
13.8 s
14.2 s
Trap speed
1/4 mile
402 m
169 km/h
105 mph
163 km/h
102 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
ACAce4.6 i V8 32V
326 hp
243 kW
BMW6 Series Convertible (E64)645Ci
333 hp
248 kW

BMW 6 Series Convertible (E64) 645Ci has 7 hp more than AC Ace 4.6 i V8 32V.

The biggest power difference is between AC Ace 4.6 i V8 32V and BMW 6 Series Convertible (E64) 645Ci: 7 hp (5 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
ACAce4.6 i V8 32V
427 Nm
315 lb-ft
BMW6 Series Convertible (E64)645Ci
450 Nm
332 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
ACAce4.6 i V8 32V
1,510 kg
3,329 lb
BMW6 Series Convertible (E64)645Ci
1,815 kg
4,001 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
ACAce4.6 i V8 32V
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)645Ci
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
ACAce4.6 i V8 32V5.7 s
BMW6 Series Convertible (E64)645Ci6.1 s

Although BMW 6 Series Convertible (E64) 645Ci has more power, AC Ace 4.6 i V8 32V is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between AC Ace 4.6 i V8 32V and BMW 6 Series Convertible (E64) 645Ci: 0.4 s.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
ACAce4.6 i V8 32V
216 hp/t
161 kW/t
4.6 kg/hp
BMW6 Series Convertible (E64)645Ci
183 hp/t
137 kW/t
5.5 kg/hp

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
ACAce4.6 i V8 32V
326 hp
243 kW
5.7 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)645Ci
333 hp
248 kW
6.1 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
ACAce4.6 i V8 32V
Power
326 hp
243 kW
0-100 km/h5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
185 L
6.5 cu ft
Length
4,420 mm
174.0 in
Height
1,300 mm
51.2 in
BMW6 Series Convertible (E64)645Ci
Power
333 hp
248 kW
0-100 km/h6.1 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in

Detailed score breakdown

Detailed score breakdown
VehicleACAce4.6 i V8 32VBMW6 Series Convertible (E64)645Ci
Power
326 hp
243 kW
333 hp
248 kW
Torque
427 Nm
315 lb-ft
450 Nm
332 lb-ft
Acceleration
5.7 s
6.1 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,510 kg
3,329 lb
1,815 kg
4,001 lb
Fuel consumption
-
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
185 L
6.5 cu ft
Length
4,420 mm
174.0 in
Height
1,300 mm
51.2 in
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in
Range score
-
543 km
337 mi
Trunk score
185 L
6.5 cu ft
300 L
10.6 cu ft
Power-to-weight score
216 hp/t
161 kW/t
4.6 kg/hp
183 hp/t
137 kW/t
5.5 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehicleBMW 6 Series Convertible (E64) 645Ci
Consumption12.9 L/100 km18.2 mpg US21.9 mpg UK
Cost / 100 km22.58 LC100 km
Cost / 100 mi36.33 LC100 mi
Annual fuel used1,935 L511 US gal426 UK gal
Annual fuel cost3,386 LC/year

Head-to-head comparisons

AC Ace 4.6 i V8 32V

  • Is 305 kg lighter
  • Is 0.4 s quicker from 0-100 km/h
  • Has 32 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Lightest
  • Best power-to-weight ratio

Cons

  • Lowest power
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
AC Ace 4.6 i V8 32V
BMW 6 Series Convertible (E64) 645Ci
Compare selected cars
2 vehicles selected

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